WO2014137155A1 - Procédé et appareil pour contrôler un brouillage dans un système de communication sans fil - Google Patents

Procédé et appareil pour contrôler un brouillage dans un système de communication sans fil Download PDF

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Publication number
WO2014137155A1
WO2014137155A1 PCT/KR2014/001806 KR2014001806W WO2014137155A1 WO 2014137155 A1 WO2014137155 A1 WO 2014137155A1 KR 2014001806 W KR2014001806 W KR 2014001806W WO 2014137155 A1 WO2014137155 A1 WO 2014137155A1
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information
interference
signal
dmrs
crs
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PCT/KR2014/001806
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English (en)
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Hyojin Lee
Younsun Kim
Yongjun Kwak
Youngbum Kim
Juho Lee
Hyoungju Ji
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Samsung Electronics Co., Ltd.
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Priority to CN201480012443.0A priority Critical patent/CN105122701B/zh
Publication of WO2014137155A1 publication Critical patent/WO2014137155A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

Definitions

  • the present invention generally relates to a method and apparatus for controlling interference in a wireless communication system, and more particularly, the present invention relates to a method and apparatus for transmitting control information for use in detection of interference signals in a wireless communication system.
  • the mobile communication system has evolved into a high-speed, high-quality wireless packet data communication system to provide data and multimedia services beyond the early voice-oriented services.
  • various mobile communication standards such as High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution (LTE), and LTE-Advanced (LTE-A) defined in 3rd Generation Partnership Project (3GPP), High Rate Packet Data (HRPD) defined in 3rd Generation Partnership Project-2 (3GPP2), and 802.16 defined in IEEE, have been developed to support the high-speed, high-quality wireless packet data communication services.
  • LTE is a communication standard developed to support high speed packet data transmission and to maximize the throughput of the radio communication system with various radio access technologies.
  • LTE-A is the evolved version of LTE to improve the data transmission capability.
  • LTE base stations and terminals are based on 3GPP Release 8 or 9 while LTE-A base stations and terminals are based on 3GPP Release 10.
  • the 3GPP standard organization is specifying the next release for more improved performance beyond LTE-A.
  • the existing 3rd and 4th generation wireless packet data communication systems (such as HSDPA, HSUPA, HRPD, and LTE/LTE-A) adopt Adaptive Modulation and Coding (AMC) and Channel-Sensitive Scheduling techniques to improve transmission efficiency.
  • AMC allows the transmitter to adjust the data amount to be transmitted according to the channel condition. That is, the transmitter is capable of decreasing the data transmission amount for a bad channel condition so as to fix the received signal error probability at a certain level, or increasing the data transmission amount for a good channel condition so as to transmit a large amount of information efficiently while maintaining the received signal error probability at an intended level.
  • the Channel Sensitive-Scheduling allows the transmitter to serve the user having a good channel condition selectively among a plurality of users so as to increase the system capacity as compared to allocating a channel fixedly to serve a single user. This increase in system capacity is referred to as multi-user diversity gain.
  • Both the AMC and Channel Sensitive-Scheduling are methods of adopting the best modulation and coding scheme at the most efficient time based on partial channel state information feedback from the receiver.
  • the transmitter determines the optimal data rate in consideration of the number of layers for use in MIMO transmission.
  • the MIMO system which transmits radio signals using a plurality of transmit antennas can be classified into one of Single-User MIMO (SU-MIMO) for allocating one time-frequency resources to a single user and a Multi-User MIMO (MU-MIMO) for allocating one time-frequency resources to multiple users through spatial multiplexing.
  • SU-MIMO Single-User MIMO
  • MU-MIMO Multi-User MIMO
  • SU-MIMO Single-User MIMO
  • a radio signal addressed to a receiver is transmitted from a plurality transmit antennas on a plurality of spatial layers.
  • the receiver has to have a plurality of receive antennas for receiving the signal transmitted on the plural spatial layers correctly.
  • the MU-MIMO is advantageous in that there is no need for the receiver to have multiple receive antennas.
  • the MU-MIMO has a drawback in that the radio signals transmitted to different receivers on the same time-frequency resource are likely to interfere to each other.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • FIG. 1 is a graph illustrating a relationship between time and frequency resources in LTE/LTE-A system.
  • the radio resource for transmission from the evolved Node B (eNB) to a User Equipment (UE) is divided into Resource Blocks (RBs) 110 in the frequency domain and subframes 120 in the time domain.
  • RB Resource Blocks
  • an RB consists of 12 consecutive carriers and occupies 180kHz bandwidth in general.
  • a subframe consists of 14 OFDM symbols and spans 1msec.
  • the LTE/LTE-A system allocates resources for scheduling in units of subframes in the time domain and in units of RBs in the frequency domain.
  • FIG. 2 is a time-frequency grid illustrating a single resource block of a downlink subframe as a smallest scheduling unit in the LTE/LTE-A system.
  • the radio resource is of one subframe 210 in the time domain and one RB 220 in the frequency domain.
  • the radio resource consists of 12 subcarriers in the frequency domain and 14 OFDM symbols in the time domain, i.e. 168 unique frequency-time positions.
  • each frequency-time position is referred to as Resource Element (RE).
  • One subframe consists of two slots, and each slot consists of 7 OFDM symbols.
  • the radio resource structured as shown in FIG. 2 can be used for transmitting plural different types of signals as follows.
  • CRS Cell-specific Reference Signal
  • DMRS Demodulation Reference Signal
  • PDSCH Physical Downlink Shared CHannel 250: data channel transmitted in downlink which the eNB uses to transmit data to the UE and mapped to REs not used for reference signal transmission in the data region of FIG. 2
  • CSI-RS Channel Status Information Reference Signal
  • Reference Signal Reference Signal transmitted to the UEs within a cell and used for channel state measurement. Multiple CSI-RSs can be transmitted within a cell.
  • PDCCH Physical Downlink Control CHannel
  • ACK/NACK of HARQ Hybrid Automatic Repeat reQuest
  • muting may be configured in order for the UEs within the corresponding cells to receive the CSI-RSs transmitted by different eNBs in the LTE-A system.
  • the muting can be mapped to the positions designated for CSI-RS, and the UE receives the traffic signal skipping the corresponding radio resource in general.
  • muting is referred to as zero power CSI-RS (ZP CSI-RS).
  • ZP CSI-RS zero power CSI-RS
  • the muting by nature is mapped to the CSI-RS position 270 without transmission power allocation.
  • the CSI-RS 270 can be transmitted at some of the positions marked by A, B, C, D, E, F, G, H, I, and J according to the number of antennas transmitting CSI-RS.
  • the zero power CSI-RS (muting) can be mapped to some of the positions A, B, C, D, E, F, G, H, I, and J.
  • the CSI-RS can be mapped to 2, 4, or 8 REs according to the number of the antenna ports for transmission. For two antenna ports, half of a specific pattern is used for CSI-RS transmission; for four antenna ports, the entire of the specific pattern is used for CSI-RS transmission; and for eight antenna ports, two patterns are used for CSI-RS transmission. Meanwhile, muting is always performed by pattern. That is, although the muting may be applied to plural patterns, if the muting positions mismatch CSI-RS positions, it cannot be applied to one pattern partially.
  • the reference signal has to be transmitted for downlink channel state measurement.
  • the UE measures the channel state with the eNB using the CSI-RS transmitted by the eNB.
  • the channel state is measured in consideration of a few factors including downlink interference.
  • the downlink interference includes the interference caused by the antennas of neighbor eNBs and thermal noise that are important in determining the downlink channel condition. For example, in the case where the eNB with one transmit antenna transmits the reference signal to the UE with one receive antenna, the UE has to determine energy per symbol that can be received in the downlink and the interference amount that may be received for the duration of receiving the corresponding symbol to acquire Signal to Noise plus Interference Ratio (SNIR).
  • SNIR Signal to Noise plus Interference Ratio
  • the SNIR is the value obtained by dividing the received signal power by interference and noise signal strength. Typically, the higher the SNIR is, the better the reception performance is and the higher the data rate is.
  • the determined SNIR or corresponding value, or the maximum data rate supportable at the SNIR is reported to the base station for use in determining the downlink data rate. In the conventional technology, however, information on the RS as an interference signal is not exchanged, resulting in failure of efficient interference cancellation.
  • an aspect of the present invention provides an interference control method and apparatus of a UE that is capable of cancelling interference based on interference-related control information provided by the network in a cellular mobile communication system, particularly an LTE-A system.
  • an interference control method of a base station of a mobile communication system includes scheduling data to be transmitted to a terminal, and transmitting control information including data channel information on the scheduled data and interference signal information to the terminal.
  • an interference control method of a terminal in a wireless communication system includes receiving control information including information on a data channel scheduled for the terminal and interference signal information from a base station, and performing interference control based on the interference signal information.
  • a base station for controlling interference in a mobile communication system.
  • the base station includes a transceiver which transmits and receives signals to and from a terminal, and a controller which controls scheduling data to be transmitted to a terminal and transmitting control information including data channel information on the scheduled data and interference signal information to the terminal.
  • a terminal for controlling interference in a mobile communication system includes a transceiver which transmits and receives signals to and from a base station, and a controller which controls receiving control information including information on a data channel scheduled for the terminal and interference signal information from a base station and performing interference control based on the interference signal information.
  • the interference control method and apparatus of the present invention is advantageous in that the UE is capable of mitigating interference based on the interference information so as to improve communication efficiency in the wireless communication system.
  • FIG. 1 is a graph illustrating a relationship between time and frequency resources in an LTE/LTE-A system
  • FIG. 2 is a time-frequency grid illustrating a single resource block of a downlink subframe as a smallest scheduling unit in the LTE/LTE-A system;
  • FIG. 3 is a diagram illustrating an antenna arrangement in the conventional distributed antenna system
  • FIG. 4 is a diagram illustrating a situation of interference between antenna groups transmitting different UEs in the conventional distributed antenna system
  • FIG. 5 is a graph illustrating the conditional probability density function of the received signal
  • FIG. 6 is a graph illustrating the conditional probability density function under the assumption that both the desired signal and interference signal are modulated in Binary Phase Shift Keying (BPSK)
  • FIGG. 7 is a graph illustrating the conditional probability density function under the assumption that the desired signal is modulated in BPSK and the interference signal is modulated in 16QAM (Quadrature Amplitude Modulation)
  • FIG. 8 is a diagram exemplifying the desired signal and interference signal in the LTE/LTE-A system
  • FIG. 9 is a diagram illustrating a principle of the interference cancellation procedure of the terminal by applying Inference Aware Detection (IAD) based on the control signal indicating the modulation scheme applied to the interference signal according to an embodiment of the present invention
  • IAD Inference Aware Detection
  • FIG. 10 is a diagram illustrating a time-frequency resource structure according to an embodiment of the present invention.
  • FIG. 11 is a flowchart illustrating the interference information determination procedure of the UE according to an embodiment of the present invention.
  • FIG. 12 is a flowchart illustrating the interference information determination procedure of the UE according to an embodiment of the present invention.
  • FIG. 13 is a flowchart illustrating the interference signal determination procedure of the UE according to an embodiment of the present invention.
  • FIG. 14 is a block diagram illustrating a configuration of the eNB according to an embodiment of the present invention.
  • FIG. 15 is a block diagram illustrating a configuration of the UE according to an embodiment of the present invention.
  • a cellular radio mobile communication system is comprised of a plurality of cells distributed within an area. Each cell is centered around a base station responsible for communication with mobile terminals.
  • the base station includes antennas and a signal processing part for providing mobile communication services to the terminals within the cell.
  • Such a system in which the antennas are placed at the center of the cell is referred to as a Centralized Antenna System (CAS) and typical in a normal mobile communication system.
  • CAS Centralized Antenna System
  • DAS Distributed Antenna System
  • the present invention provides an interference measurement method and apparatus for efficient communication in DAS with antennas distributed in the service area of each base station.
  • the interference control method of a UE in the wireless communication system includes receiving a radio resource control signal including allocation of at least one Channel Status Information Reference Signal (CSI-RS) from an eNB, identifying a DeModulation Reference Signal (DMRS) of an interference signal and Quasi Co-Location (QCL) reference signal for at least one parameter based on the radio resource control signal, receiving downlink control information including an indicator indicating the DMRS of the interference signal and the QCL reference signal from the eNB, and estimating channel characteristics of the interference signal based on the information matching the indicator in the checked information.
  • CSI-RS Channel Status Information Reference Signal
  • DMRS DeModulation Reference Signal
  • QCL Quasi Co-Location
  • the interference control method of the base station in a wireless communication system includes transmitting a wireless resource control signal including allocation of at least one Channel Status Information Reference Signal (CSI-RS) resource to the UE and transmitting a downlink control information including an indicator indicating the DMRS of an interference signal and QCL reference signal to the UE, wherein the UE identifies the DMRS of the interference signal and QCL reference signal for at least one parameter and estimates channel characteristics of the interference signal based on the information matching the indicator in the checked information.
  • CSI-RS Channel Status Information Reference Signal
  • the terminal for controlling interference in a wireless communication system includes a receiver which receives a radio resource control signal including allocation of at least one Channel Status Information Reference Signal (CSI-RS) from an eNB and a controller which identifies a DeModulation Reference Signal (DMRS) of an interference signal and Quasi Co-Location (QCL) reference signal for at least one parameter based on the radio resource control signal, receives downlink control information including an indicator indicating the DMRS of the interference signal and QCL reference signal from the eNB, and estimates channel characteristics of the interference signal based on the information matching the indicator in the checked information.
  • CSI-RS Channel Status Information Reference Signal
  • DMRS DeModulation Reference Signal
  • QCL Quasi Co-Location
  • an eNB for controlling interference in a wireless communication system includes a transmitter which transmits a wireless resource control signal including allocation of at least one Channel Status Information Reference Signal (CSI-RS) resource to a UE and a controller which controls the transmitter to transmit a downlink control information including an indicator indicating the DMRS of an interference signal and a QCL reference signal to the UE, wherein the UE identifies the DMRS of the interference signal and QCL reference signal for at least one parameter and estimates channel characteristics of the interference signal based on the information matching the indicator in the checked information.
  • CSI-RS Channel Status Information Reference Signal
  • an interference control method of a UE in a wireless communication system includes receiving a wireless resource control signal including allocation of at least one Channel Status Information Reference Signal (CSI-RS) resource from an eNB, checking information on a DeModulation Reference Signal (DMRS) of an interference signal and Quasi Co-Location (QCL) CSI-RS for at least one parameter and downlink resource mapping information of the interference signal; receiving downlink control information including an indicator indicating jointly DMRS of the interference signal and a QCL reference signal and downlink resource mapping of a transmission cell from the eNB; and estimating channel characteristics of the interference signal based on the information matching the indicator in the checked information.
  • CSI-RS Channel Status Information Reference Signal
  • DMRS DeModulation Reference Signal
  • QCL Quasi Co-Location
  • an eNB In a typical mobile communication system, an eNB is located at the center of each cell and provides UEs with mobile communication service using one or more antennas located at a restricted place.
  • the mobile communication system in which each cell is provided with antennas arranged at the same position is referred to as a Centralized Antenna System (CAS).
  • CAS Centralized Antenna System
  • RRHs Remote Radio Heads
  • DAS Distributed Antenna System
  • FIG. 3 is a diagram illustrating an antenna arrangement in the conventional distributed antenna system.
  • the cell 300 includes five antennas including one high power transmission antenna 320 and four low power antennas 340.
  • the high power transmission antenna 320 is capable of providing at least minimum service within the coverage area of the cell while the low power antennas 340 are capable of providing UEs with a high data rate service within a restricted area.
  • the low and high power transmission antennas are all connected to a central controller and operate in accordance with the scheduling and radio resource allocation of the central controller.
  • one or more antennas may be deployed at one geometrically separated antenna position.
  • antenna(s) deployed at the same position is referred to as Remote Radio Head (RRH).
  • RRH Remote Radio Head
  • the UE receives signals from one geometrically distributed antenna group and regards the signals from other antenna groups as interference.
  • FIG. 4 is a diagram illustrating a situation of interference between antenna groups transmitting to different UEs in the conventional distributed antenna system.
  • the UE1 400 is receiving traffic signals from the antenna group 410.
  • the UE2 420, UE3 440, and UE4 460 are receiving traffic signals from antenna groups 430, 450, and 470, respectively.
  • the UE1 400 which is receiving traffic signals from the antenna group 410 is influenced by the interference of the other antenna groups transmitting traffic signals to other UEs. That is, the signals transmitted the antenna groups 430, 450, and 470 cause interference to UE1 400.
  • interferences caused by other antenna groups are classified into two categories:
  • the UE 1 400 undergoes intra-cell interference from the antenna group 430 of the same cell and inter-cell interference from the antenna groups 450 and 470 of the neighbor cell.
  • the inter-cell interference and the intra-call interference affect the data channel reception of the UE simultaneously.
  • the signal received by a UE consists of the desired signal, noise, and interference.
  • the received signal may be expressed as Equation (1).
  • Equation (1) ‘r’ denotes the received signal, ‘s’ denotes the transmitted signal, ‘noise’ denotes noise with Gaussian distribution, and ‘interference’ denotes an interference signal occurring in radio communication.
  • the interference signal may occur in the following situations.
  • the SNIR varies depending on the amount of interference and thus affects the reception performance.
  • how to control the interference (as the main factor of degrading system performance) efficiently determines the system performance.
  • various technologies for supporting Coordinated Multi-Point Transmission and Reception have been introduced to control interference.
  • CoMP the network controls the transmissions of plural eNBs or transmission points integrally at the center to determine the presence/absence of interference and interference amounts in the downlink and uplink.
  • the central controller controls one eNB to suspend signal transmission so as to avoid interference to the UE which receives signals from the other eNB.
  • an error correction code is use to correct errors occurring in the signal communication.
  • a convolution code and turbo code are used as error correction codes.
  • the receiver uses soft decision making rather than hard decision making in demodulating the symbol modulated at Quadrature Phase Shift Keying (QPSK), 16QAM, 64QAM, or the like. If ‘+1’ or ‘-1’ is transmitted by the transmitter, the receiver making a hard decision selects one of ‘+1’ and ‘-1’ and outputs the selection result. In contrast, the receiver making a soft decision outputs the information indicating which is selected between ‘+1’ and ‘-1’ and the reliability of decision making. The reliability information can be used for improving the decoding performance in the decoding process.
  • QPSK Quadrature Phase Shift Keying
  • LLR Log Likelihood Ratio
  • Equation (2) ‘r’ denotes the reception signal, and ‘s’ denotes the transmission signal.
  • the conditional probability density function is of the reception signal under the assumption that ‘+1’ is transmitted as the transmission signal.
  • LLR can be expressed in a similar way.
  • the conditional probability density function is likely to have Gaussian distribution in the situation where interference exists.
  • FIG. 5 is a graph illustrating the conditional probability density function of the received signal.
  • the first curve 500 denotes a conditional probability density function
  • the second curve 510 denotes another conventional probability density function
  • the receiver calculates LLR with log(f2/f1).
  • the conditional probability density functions of FIG. 5 correspond to the case where the noise and interference have Gaussian distribution.
  • an eNB transmits information of a few or more bits to the UE through a single Physical Downlink Shared CHannel (PDSCH) transmission.
  • the eNB encodes the information to be transmitted to the UE and modulates the encoded information in a modulation scheme such as QPSK, 16QAM, and 64QAM. Accordingly, if the PDSCH is received, the UE generates LLRs of a few dozen or more coded symbols to the decoder.
  • the noise has Gaussian distribution, but the interference may not have Gaussian distribution in any situation.
  • the reason why the interference does not have Gaussian distribution is because the interference is the radio signals transmitted to other receivers. That is, since the ‘interference’ of Equation (1) denotes the radio signals transmitted to other receivers, at least one modulation scheme of BPSK, QPSK, 16QAM, and 64QAM is applied thereto.
  • the interference signal is modulated in BPSK, the interference has a probability distribution of ‘+k’ or ‘-k’ at the same probability.
  • ‘k’ is a value determined by the signal strength attenuation effect on the radio channel.
  • FIG. 6 is a graph illustrating the conditional probability density function under the assumption that both the desired signal and interference signal are modulated in BPSK.
  • the conditional probability density function of FIG. 6 differs from that of FIG. 5.
  • the first curve 620 denotes the conditional probability density function
  • the second curve 630 denotes the conditional probability density function .
  • the size of the distribution distance 610 is determined depending on the signal strength of the interference signal and depends on the influence of the radio channel.
  • the receiver calculates LLR with log(f4/f3). This value differs from the LLR value in the case of FIG. 5 due to the difference in conditional probability density function. That is, the LLR obtained in consideration of the modulation scheme of the interference signal differs from the LLR obtained under the assumption of Gaussian distribution.
  • FIG. 7 is a graph illustrating the conditional probability density function under the assumption that the desired signal is modulated in BPSK and the interference signal is modulated in 16QAM.
  • conditional probability density function may vary depending on the modulation scheme of the interference.
  • the desired signal is modulated in BPSK in both the cases of FIGs. 6 and 7, while the interference is modulated in BPSK in FIG. 6 and 16QAM in FIG. 7. That is, although the desired signal is modulated in the same modulation scheme, the conditional probability density function varies depending on the modulation scheme of the interference signal, resulting in different LLRs.
  • the first curve 700 denotes the conditional probability density function
  • the second curve 710 denotes the conditional probability function .
  • LLR varies depending on the assumption for interference.
  • FIG. 8 is a diagram exemplifying the desired signal and interference signal in the LTE/LTE-A system.
  • the UE attempts to receive the radio signal 800.
  • the signal 810 transmitted to another UE causes interference to the UE.
  • this situation occurs when the desired signal and the interference signal are transmitted at the same subframe on the same frequency band.
  • FIG. 8 it is assumed that the desired signal and the interference signal are transmitted across N RBs.
  • the UE in order to calculate the optimal LLR in the process of detecting the desired signal, the UE has to know the conditional probability density reflecting the statistical characteristic of the interference signal 810 accurately.
  • the main information for the receiver to achieve this includes at least one modulation scheme applied to the interference signal and received signal strength of the interference signal. That is, the value designated by reference number 610 of FIG. 6 can be acquired based on at least one of the modulation scheme and signal strength of the interference signal, thereby calculating an accurate conditional probability density function.
  • the eNB may include the information on the radio signal 800 transmitted to the UE and the modulation scheme of the interference signal 810 in the control information for use in data (PDSCH) scheduling.
  • the control information for use in scheduling the PDCCH to the UE in the legacy LTE-A system is transmitted through the PDCCH or enhanced PDCCH (ePDCCH), the scheduling information is shown in Table 1, and both the control and scheduling information include the information on the radio signal 800 transmitted to the UE.
  • MCS Modulation and Coding Scheme
  • Table 2 shows 2-bit control information for indicating the modulation scheme of the interference signal.
  • the eNB uses the 2-bit control signal as shown in Table 2, the eNB notifies the UE of the modulation scheme applied to the signal causing interference to the UE.
  • the terminals assumes QPSK with the control information set to ‘00’, and 16QAM with control information set to ‘01’, 64QAM with control information set to ‘10’. If the control information is set to ‘11’, the UE assumes that the interference signal is not modulated in any modulation scheme.
  • the eNB may notify the UE that no specific modulation scheme is applied to the interference in the following cases.
  • the neighbor eNBs do not transmit signals.
  • the interference signal has no regular modulation scheme, in this case there are interference signals having different modulation schemes on the time-frequency resource occupied by the reception signal of the UE. For example, if the UE receives PDSCH on RB1 and RB2 in the frequency domain, the interference signal may be modulated in QPSK in RB1 and 16QAM in RB2. Even when the interference signal exists at a part of the frequency band carrying the reception signal, the eNB may notify the UE that no modulation scheme is applied to the interference signal by setting the control information to ‘11’.
  • the values mapped to the individual bits are not limited to the case of Table 2 but may be set differently.
  • Table 3 shows 1-bit control information for indicating the modulation scheme of the interference signal.
  • the 1 bit may be set to indicate whether the UE applies interference cancellation. If the control information indicates that the interference signal is modulated in a certain modulation scheme, the UE applies all available modulation schemes and then selects the most reliable modulation scheme. If the control information indicates that the interference signal is not modulated in any modulation scheme, the UE determines that no modulation scheme is applied to the interference signal as in Table 2. In an embodiment of the present invention, in order to instruct the UE to not perform interference cancellation, the eNB may send the UE the 1-bit control information set to 1 as shown in Table 3.
  • the UE is capable of determining the modulation scheme applied to the signal causing interference to the desired signal.
  • FIG. 9 is a diagram illustrating a principle of the interference cancellation procedure of the terminal by applying Inference Aware Detection (IAD) based on the control signal indicating the modulation scheme applied to the interference signal according to an embodiment of the present invention
  • FIG. 10 is a diagram illustrating a time-frequency resource structure according to an embodiment of the present invention.
  • IAD Inference Aware Detection
  • the UE receives the PDSCH across RB1, RB2, RB3, and RB 4 in the frequency domain.
  • the interference signal 930 affecting the desired signal of the UE is received simultaneously.
  • the UE determines the modulation scheme applied to the interference signal 930.
  • the UE measures the interference signal on the frequency bands 900, 910 and 920 of the desired signal and generates LLRs on the PDSCHs received in the frequency bands 900, 910, and 920 of the desired signal based on the measurement result.
  • the reason why the UE measures the interference signal in the frequency bands 900, 910, and 920 of the desired signal is because the radio channel varies on the respective frequency bands due to the frequency selective fading.
  • the radio channel in RB1 differs from the radio channel in RB2. If the radio channel varies in this way, the statistical characteristic of the interference varies too.
  • IAD is implemented in such a way of grouping the entire system bandwidth into a plurality of RB Groups (RBGs) and performing interference measurement per RBG.
  • the UE checks the RBGs of the frequency bands 900, 910, and 920 of the signal carrying PDSCH and measures interference independently by taking into consideration thereof.
  • the UE measures the interference signal causing interference to PDSCH addressed to itself to determine the received signal strength for use in IAD operation.
  • the present invention provides a method for measuring DMRS as one of the signals causing interference for interference measurement.
  • DMRS is designed for measuring the influence of the radio channel in receiving PDSCH at the UE. That is, the UE estimates the radio channel carrying PDSCH based on DMRS. Since the same precoding is applied to PDSCH and DMRS, the UE is capable of checking the influence of the interference occurring at the PDSCH region by measuring DMRS.
  • DMRS can be used to estimate interference caused by other eNBs as well as to receive the PDSCH. That is, the UE may measure the DMRS transmitted from another eNB to another UE to check whether the signal addressed to the other UE causes interference to the UE.
  • An embodiment of the present invention provides an interference channel measurement method which is implemented in such a way of defining, at the eNB, DMRS allocation resource for interference measurement and notifying the DMRS allocation resource of the UE. That is, the UE receives the information on DMRS for both the desired signal and interference through scheduling information of the eNB in receiving PDSCH.
  • the DMRS information for UE may include at least one of following elements:
  • DMRS information 1 DMRS information for use in measuring a channel carrying PDSCH addressed to the UE
  • DMRS information 2 DMRS information for use in interference channel measurement of the UE (Interferer DMRS information)
  • the DMRS information 1 is used for receiving the PDSCH addressed to the UE itself and corresponds to the information on the antenna port, scrambling ID, and then number of layers in Table 1. That is, the above information may include antenna ports allocated for PDSCH transmission to the UE itself and the scrambling sequence used.
  • the DMRS information 2 is necessary for the UE to perform channel measurement of interference and may include at least one of the following information for DMRS used by the UE for interference measurement:
  • the DMRS information 2 includes the information on the antenna ports to which DMRS for interference measurement is mapped, scrambling sequence applied to DMRS, and number of layers.
  • the number of DMRS layers for interference may be notified with explicit information or fixed to 1 without need to be included in the scheduling information.
  • the DMRS allocated to other UEs are referred to as interferer DMRS, and the interferer DMRS-related information is referred to as interferer DMRS information.
  • the DMRS information 1 and DMRS information 2 may be included in the PDSCH scheduling information independently, and Table 4 shows a case where the DMRS information 1 and DMRS information 2 are configured in the same way.
  • Table 4 provides the DMRS antenna ports, DMRS scrambling sequence, and number of layers in the first and second columns corresponding to the scheduling of PDSCH with one codeword transmission, and the third and fourth columns corresponding to the scheduling of PDSCH with two codewords transmission.
  • DMRS antenna ports are arranged in one RB as shown in FIG. 10 and mapped to 4 REs using an orthogonal code of length 4 as shown in Table 5.
  • the DMRS sequence is a Gold sequence of length 31 and varies depending on the configuration of the initial state. That is, the initial state value of the same scrambling sequence generator determines the value of the sequence to be generated.
  • the initial state for the scrambling sequence of DMRS is defined in Equation (3) as follows:
  • Equation (3) denotes the slot index which is an integer selected in the range from 0 to 19 and information available after the UE acquires time synchronization. Since can be obtained after the UE acquires time synchronization, the extra information necessary for the UE in association with interferer DMRS scrambling is and values.
  • Equation (3) corresponds to the virtual Cell ID which is an integer in the range from 0 to 504. denotes the scid in Table 4 and is set to 0 or 1.
  • LTE/LTE-A one of the two values is determined according to . That is, is set to the value of preconfigured through higher layer signaling for the case of set to 0 and the value of preconfigured through higher layer signaling for the case of set to 1.
  • Table 4 provides the case under the assumption that the DMRS information 1 for the desired signal and the DMRS information 2 for interference are configured with 3 bits respectively and notified in the same manner and PDSCH transmission is possible on up to 4 layers and scids of ports 9 and 10 are set to 0, the present invention is not limited thereto.
  • the DMRS informations 1 and 2 may differ from each other in size, and the DMRS information 1 for the desired signal may be designed to transmit PDSCH on up to 8 layers.
  • the UE is allocated the DMRS for the desired signal and the DMRS for interference and includes the information on the interference channel for use in DMRS-based channel measurement in the scheduling information so as to improve DMRS channel estimation performance to interference.
  • the received signals may be expressed as a matrix represented by Equation (4).
  • each component can be modeled as a probability variable having independent Gaussian distribution as the reception noise of the UE.
  • the UE uses a channel estimator to estimate channel value per subcarrier with the received signal and a known reference signal value.
  • Least Square (LS) and Minimum Mean Square Error (MMSE) are representative channel estimation methods.
  • the LS channel estimation method is expressed by Equation (5).
  • Equation (6) denotes a set of complex vectors having N components.
  • Equation (6) The MMSE estimation method is expressed by Equation (6).
  • Equation (5) denotes a set of NxN complex matrices, denotes an autocorrelation matrix of the channel matrix and is defined as which is derived simply from a delay profile of the channel between the eNB and the UE. denotes the variance of reception noise.
  • Equations (5) and (6) although the LS estimation method is implemented simply with the equation of the reception signal and reference signal as compared to the MMSE estimation method, the MMSE estimation method is advantageous in that a more accurate channel estimation value can be acquired using the delay profile and the statistical characteristic of the channel such as variance of the reception noise.
  • the UE in order to acquire more accurate channel estimation performance with DMRS, it is necessary for the UE to know the statistical characteristic of the channel such as the delay profile of the channel carrying the DMRS.
  • the DMRS is transmitted in the RBs including PDSCH scheduling for the UE, the UE receiving PDSCH in a small number of RBs fails to secure resources large enough to extract the statistical characteristic of the channel. Accordingly, it may be considered to extract the statistical characteristic of the channel for use in DMRS channel estimation from the CRS or CSI-RS transmitted on the channel having the same statistical characteristic as DMRS across the entire system frequency band.
  • the statistical characteristic of the channel which is extracted from the CRS or CSI-RS of the corresponding cell can be used for channel estimation based on DMRS since the UE receives the PDSCH and DMRS from the serving cell; however, there is no need to transmit the CRS or CSI-RS for extracting the statistical characteristic in the case of estimating DMRS of the interference component, because the cell incurring the interference is not clear.
  • the CRS or CSI-RS for extracting the statistical characteristic for DMRS-based channel estimation is in the relationship of Quasi Co-Located (QCL) at the same position as DMRS.
  • the CRS and CSI-RS for extracting the corresponding channel characteristic has to be assumed as QCL with the corresponding DMRS from the view point of Doppler shift, Doppler spread, average delay, and delay spread.
  • FIG. 11 is a flowchart illustrating the interference information determination procedure of the UE according to an embodiment of the present invention.
  • a method for the UE to receive the information on the CSI-RS for extracting the statistical characteristic of the channel for channel estimation of DMRS corresponding to interference in receiving specific PDSCH scheduling is described with reference to FIG. 11.
  • the UE is allocated at least one CSI-RS resource through Radio Resource Control (RRC) information at step 1110.
  • RRC Radio Resource Control
  • the RRC information per CSI-RS for allocating the CSI-RS resource includes at least one of the following informations:
  • the CSI-RS allocation information may further include information on whether the CSI-RS is of the serving cell to which the UE has connected or an interfere cell.
  • the UE checks mapping information between the downlink control information value corresponding to DMRS for interference and QCL information of the CSI-RS and the CSI-RS index in step 1120. This operation of checking the information may be performed based on the received RRC signal.
  • the CSI-RS index corresponds at least one CSI-RS allocated at step 1110. That is, the index of CSI-RS capable of extracting statistical characteristic of the channel for channel estimation of the corresponding DMRS based on the QCL relationship with DMRS for interference is mapped to the downlink control information value corresponding to the QCL information in advance. In other words, if the downlink control information corresponding to the QCL information between DMRS and CSI-RS is 1 bit, step 1120 configures each row of Table 6 based on the RRC information.
  • step 1120 configures each row of Table 7 based on the RRC information.
  • the information value of Table 6 or 7 may have no specific CSI-RS index and be configured for the operation without applying IAD or interpreted as the operation in which IAD is not applied to the corresponding information value if the CSI-RS index is not configured through RRC information.
  • Table 7 QCL information value of DMRS for interference Description 00 First CSI-RS index configured with RRC information 01 Second CSI-RS index configured with RRC information 10 Third CSI-RS index configured with RRC information 11 Fourth CSI-RS index configured with RRC information
  • the UE checks the downlink control information transmitted on PDCCH in an actual PDSCH scheduling situation to read the QCL information value of DMRS for interference included therein to check the description of the corresponding value in Table 6 or 7 configured through RRC signaling at step 1120 so as to check the CSI-RS as QCL with DMRS for interference which is used for applying IAD to the PDSCH scheduled currently.
  • the UE assumes that the CSI-RS corresponding to the second CSI-RS index configured through RRC signaling and the DMRS of the current interference are QCL in view of Doppler shift, Doppler spread, average delay, and delay spread.
  • the UE performs DMRS channel estimation using the statistical characteristic of the channel extracted from CSI-RS configured as QCL at step 1140.
  • the UE may perform interference cancellation process based on the estimated DMRS channel information.
  • the eNB may check the CRS information of the cell incurring interference based on the CRS information in the CSI-RS information configured as QCL in estimating DMRS in the case of applying IAD so as to perform decoding on PDSCH by selecting REs to which IAD is applied and CRS interference is cancelled.
  • the eNB may send the UE the related information.
  • the information on the CRS configured as QCL of DMRS for interference is unlike the first embodiment. In this case, there is no need of allocating extra CSI-RS resources for extracting statistical characteristics of the interference channel to the UE as compared to the first embodiment. That is, when receiving specific PDSCH scheduling, the information on CRS for extracting statistical characteristics of the channel other than CSI-RS for channel estimation of DMRS corresponding to the interference is transmitted.
  • FIG. 12 is a flowchart illustrating the interference information determination procedure of the UE according to the second embodiment of the present invention.
  • the UE checks the mapping of the downlink control information value corresponding to QCL information of DMRS and CRS for interference and the CRS resource information through RRC information at step 1210.
  • the CRS resource information may include at least one of following information.
  • step 1210 becomes a process of configuring each row of Table 8 through RRC information.
  • Table 8 QCL information value of DMRS for interference Description 0
  • step 1210 becomes a process of configuring each row of Table 9 through RRC signaling.
  • the information value of Tables 8 or 9 may be configured through a process of not including specific CRS resource information and not applying IAD and, if CRS is not configured through RRC signaling, the corresponding information value may be interpreted through an operation to which the UE does not apply IAD.
  • the UE checks the downlink control information transmitted on PDCCH in an actual PDSCH scheduling situation, reads QCL information of DMRS for interference included therein to check the description in Tables 8 or 9 preconfigured through RRC signaling at step 1210, and checks the CRS resource as QCL with DMRS for the interference in applying IAD to currently scheduled PDSCH. For example, if the downlink control information value corresponding to QCL information of DMRS and CRS is 2 bits and if the corresponding information value transmitted on PDCCH is set to 01, the UE interprets this as the second CRS configured through RRC signaling and DMRS for current interference are QCL in view of Doppler shift, Doppler spread, average delay, and delay spread.
  • the UE performs DMRS channel estimation using the statistical characteristics of the channel which is extracted from CRS configured as QCL at step 1230, and ends the channel estimation procedure.
  • the UE can be considered for the UE to perform an additional operation of checking the location of the CRS using CRS information configured as QCL through the above procedure and selecting PDSCH REs to which IAD is applied. That is, since the cell incurring the interference component is not clear, it is difficult for the UE to check whether the data modulated in a specific modulation scheme or CRS is mapped to specific time-frequency resource for the interference. Accordingly, the eNB may check the CRS information of the cell incurring interference based on the CRS information in the CSI-RS information configured as QCL in estimating DMRS in the case of applying IAD so as to perform decoding on PDSCH by selecting REs to which IAD is applied and CRS interference is cancelled.
  • a method of notifying information on the REs of the interferer cell to which IAD is applied is added to the method of configuring QCL necessary for estimating the channel of DMRS for interferences that is provided in the first and second embodiments.
  • the third embodiment may be implemented independently of the first and second embodiments.
  • the cell incurring the interference component Since the cell incurring the interference component is not clear, it is difficult for the UE to check whether the data modulated in a specific modulation scheme or CRS is mapped to specific a time-frequency resource for the interference. Also, it is not clear whether a specific time-frequency resource is allocated for PDSCH or PDCCH for the interference.
  • IAD When IAD is applied, it is necessary for the eNB to send the UE the resource mapping information of the cell incurring interference in addition to CRS or CSI-RS information for extracting statistical characteristics for estimating DMRS.
  • FIG. 13 is a flowchart illustrating the interference signal determination procedure of the UE according to the third embodiment of the present invention.
  • the UE checks the downlink control information value corresponding to the resource mapping information, CRS position, and the mapping information of PDSCH start symbol in the interference cell to which IAD is applied through RRC information.
  • the information on the CRS position and PDSCH start symbol of the interferer cell may include at least one of following information.
  • PDSCH start symbol one of ⁇ 1, 2, 3, 4 ⁇
  • step 1310 becomes a process of configuring each row of Table 10 through RRC information.
  • Table 10 Resource mapping information of interferer cell Description 0 1.
  • First CRS resource information configured with RRC information - CRS offset - Number of CRS antenna ports - MBSFN subframe information2.
  • First PDSCH start symbol information configured with RRC information 1 1.
  • Second CRS resource information configured with RRC information - CRS offset - Number of CRS antenna ports - MBSFN subframe information2.
  • Second PDSCH start symbol information configured with RRC information
  • step 1310 becomes a process of configuring each row of Table 11 through RRC signaling.
  • the information value of Tables 10 or 11 may be configured through operation without inclusion of specific resource mapping information and application of IAD and, if CRS resource information is not configured through RRC signaling, the corresponding information value may be interpreted through the operation to which IAD is not applied.
  • Table 11 Resource mapping information value of interferer cell Description 00 1.
  • First CRS resource information configured with RRC information - CRS offset - Number of CRS antenna ports - MBSFN subframe information2.
  • Second CRS resource information configured with RRC information - CRS offset - Number of CRS antenna ports - MBSFN subframe information2.
  • Fourth PDSCH start symbol information configured with RRC information configured with RRC information
  • the UE checks the downlink control information transmitted on PDCCH in the actual PDSCH, reads resource mapping information of the interferer cell which is included therein to check the description of Tables 10 or 11 preconfigured through RRC signaling at step 1310, and checks the CRS resource information and PDSCH start symbol information for interference which is used for applying IAD to the currently scheduled PDSCH. For example, if the resource mapping information value of the interferer cell is 2 bits and if the corresponding information value transmitted on PDCCH is set to 01, the UE checks the CRS resource information and PDSCH start symbol information of the second interference cell configured through RRC signaling.
  • the UE applies IAD for decoding PDSCH received using the CRS resource information and PDSCH start symbol information of the interferer cell checked at step 1320.
  • the UE may apply IAD to PDSCH decoding in consideration of interference components of other signals excluding an interference part of CRS of the interference cell in decoding PDSCH received by the UE based on the CRS resource information and PDSCH start symbol information of the interferer cell.
  • the resource mapping information of the interferer cell which is provided in Tables 10 or 11 for the UE according to the third embodiment of the present disclosure may be included in the downlink scheduling information independently of CSI-RS or CRS information configured as QCL in the first and second embodiments or notified to the UE along with the resource mapping information and QCL information of the interferer cell as 1-bit or 2-bit information.
  • the integration of first and third embodiments may be expressed as provided in Table 12 by combining columns of Tables 7 and 11.
  • Table 12 QCL of DMRS for interference and resource mapping information value of interferer cell QCL-related notification Resource mapping-related notification of interferer cell 00
  • First CSI-RS index configured with RRC information 1.
  • First CRS resource information configured with RRC - CRS offset - Number of CRS antenna ports - MBSFN subframe information2.
  • First PDSCH start symbol information configured with RRC information 01
  • Second CSI-RS index configured with RRC information 1.
  • Second CRS resource information configured with RRC - CRS offset - Number of CRS antenna ports - MBSFN subframe information2.
  • Second PDSCH start symbol information configured with RRC information 10
  • Third CSI-RS index configured with RRC information 1.
  • Third CRS resource information configured with RRC - CRS offset - Number of CRS antenna ports - MBSFN subframe information2.
  • Third PDSCH start symbol information configured with RRC information 11
  • Fourth CSI-RS index configured with RRC information 1.
  • Fourth CRS resource information configured with RRC - CRS offset - Number of CRS antenna ports - MBSFN subframe information2.
  • FIG. 14 is a block diagram illustrating a configuration of the eNB according to an embodiment of the present invention.
  • the eNB controller 1400 determines IAD configuration of the UE, PDSCH scheduling, interferer cell configuration for a specific UE, and corresponding CSI-RS and CRS information.
  • the IAD configuration of the UE which is determined by the eNB is notified to the UE by means of the transmitter 1410.
  • PDCCH/ePDCCH and PDSCH are transmitted to the UE by means of the transmitter 1410.
  • the eNB transmits PDCCH and receives channel state information based on the IAD configuration of the UE by means of the receiver 1420.
  • FIG. 15 is a block diagram illustrating a configuration of the UE according to an embodiment of the present invention.
  • the UE controller 1500 receives the control information on the IAD configuration from the eNB by means of the receiver 1520 to check the radio resource for use in interference measurement, QCL information of interference DMRS for specific PDSCH scheduling, and resource mapping information of the interference cell.
  • the receiver 1520 performs decoding on the PDCCH/ePDCCH in order for the UE controller 1500 to determine the scheduling information of the PDSCH.
  • the UE may acquire the control information related to IAD from the information notified through the PDCCH/ePDCCH.
  • the interference control method and apparatus of the present invention is advantageous in that the UE is capable of mitigating interference based on the interference information so as to improve communication efficiency in the wireless communication system.

Abstract

La présente invention se rapporte à un procédé et à un appareil adaptés pour transmettre des informations de commande. Le procédé et l'appareil selon l'invention sont utilisés pour détecter un brouillage dans un signal, dans un système de communication sans fil. Un procédé de contrôle de brouillage d'une station de base d'un système de communication mobile consiste : à programmer des données devant être transmises à un terminal ; et à transmettre au terminal des informations de commande comprenant des informations de canal de données à propos des données programmées et des informations sur le signal de brouillage.
PCT/KR2014/001806 2013-03-07 2014-03-05 Procédé et appareil pour contrôler un brouillage dans un système de communication sans fil WO2014137155A1 (fr)

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US20210297115A1 (en) * 2016-03-31 2021-09-23 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving reference signals in wireless communication
US11509355B2 (en) * 2016-03-31 2022-11-22 Samsung Electronics Co., Ltd. Method and apparatus for transmitting and receiving reference signals in wireless communication

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EP2775642B1 (fr) 2021-12-08
CN105122701B (zh) 2018-10-19
EP2775642A3 (fr) 2015-07-22
KR102089437B1 (ko) 2020-04-16
US10485021B2 (en) 2019-11-19
KR20140111136A (ko) 2014-09-18
EP2775642A2 (fr) 2014-09-10
CN105122701A (zh) 2015-12-02

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